摘要
寻找并开发经济可行、稳定可靠且高效的光电极材料是光电化学(PEC)水分解领域亟待解决的关键挑战。在众多候选材料中,氧化钨(WO_(3))凭借其独特的物理化学性质脱颖而出,成为备受青睐的优选材料之一。为了进一步优化氧化钨(WO_(3))光电极的光电性能,本文选用了无毒、化学稳定性优异且资源丰富的α-Fe_(2)O_(3),通过简单的水热法将其与WO_(3)有效结合,成功构筑了全氧化物WO_(3)/α-Fe_(2)O_(3)复合电极,并对其组织结构、光学性能和光电化学性能进行了表征分析。实验结果表明,在1.23 V vs.RHE的偏压条件下,该复合电极的光电流密度达到了0.56 mA/cm^(2),是WO_(3)光电极的1.87倍。这可归因于多方面的协同效应:WO_(3)一维纳米棒结构为电子提供了高效的传输通道,确保了高导电性;α-Fe_(2)O_(3)的引入不仅提高了可见光利用效率,还与WO_(3)形成了异质结结构,有效抑制了电子-空穴对的复合,促进了载流子的高效分离与传输,从而实现了光电性能的提高。本文为构筑经济、稳定且高效的光电极材料提供了一些理论参考。
Exploring and developing economically viable,stable,and efficient photoelectrode materials have emerged as critical challenges that require urgent solutions in the field of photoelectrochemical(PEC)water splitting.Among the myriad of candidate materials,tungsten oxide(WO_(3))stands out due to its unique physicochemical properties,becoming one of the preferred materials in the field of PEC water splitting.In this work,the non-toxic,chemically stable,and abundantα-Fe_(2)O_(3)was selected,and effectively combined with WO_(3)through a simple hydrothermal method,resulting in the successful fabrication of all-oxide WO_(3)/α-Fe_(2)O_(3)composite photoelectrodes to further optimize the photoelectrochemical performance of WO_(3)photoelectrodes.The structural,optical,and photoelectrochemical properties of the composite photoelectrode were characterized and analyzed.The WO_(3)/α-Fe_(2)O_(3)photoelectrode yields a photocurrent density of 0.56 mA/cm^(2)at 1.23 V vs.RHE,which is 1.87 times than that of WO_(3)photoanodes(0.30 mA/cm^(2)).The improvement can be attributed to synergistic effects:the one-dimensional nanorod structure of WO_(3)provides efficient transmission channels for electrons,ensuring high conductivity;the incorporation ofα-Fe_(2)O_(3)not only enhances visible light utilization efficiency but also forms a heterojunction with WO_(3),effectively inhibiting the recombination of electron-hole pairs and facilitating the efficient separation and transport of charge carriers,thereby achieving an improvement in photoelectrochemical performance.This study offers valuable insights and references for the construction of economical,stable,and highly efficient photoelectrode materials.
作者
李艳婷
王禹婷
马晓伟
林万明
关鹏丽
Li Yanting;Wang Yuting;Ma Xiaowei;Lin Wanming;Guan Pengli(College of New Energy and Materials Engineering,Shanxi University of Electronic Science and Technology,Linfen 041000,China)
出处
《山东化工》
CAS
2024年第17期69-72,77,共5页
Shandong Chemical Industry
基金
山西省高等学校科技创新计划项目(2023L446)。
